C:/xampp/htdocs/moodle/lib/zend/Zend/Validate/File/IsImage.php

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<?php
require_once 'Zend/Validate/File/MimeType.php';

class Zend_Validate_File_IsImage extends Zend_Validate_File_MimeType
{
    const FALSE_TYPE   = 'fileIsImageFalseType';
    const NOT_DETECTED = 'fileIsImageNotDetected';
    const NOT_READABLE = 'fileIsImageNotReadable';

    protected $_messageTemplates = array(
        self::FALSE_TYPE   => "File '%value%' is no image, '%type%' detected",
        self::NOT_DETECTED => "The mimetype of file '%value%' could not be detected",
        self::NOT_READABLE => "File '%value%' can not be read",
    );

    public function __construct($mimetype = array())
    {
        if ($mimetype instanceof Zend_Config) {
            $mimetype = $mimetype->toArray();
        }

        $temp    = array();
        // http://de.wikipedia.org/wiki/Liste_von_Dateiendungen
        // http://www.iana.org/assignments/media-types/image/
        $default = array(
            'application/cdf',
            'application/dicom',
            'application/fractals',
            'application/postscript',
            'application/vnd.hp-hpgl',
            'application/vnd.oasis.opendocument.graphics',
            'application/x-cdf',
            'application/x-cmu-raster',
            'application/x-ima',
            'application/x-inventor',
            'application/x-koan',
            'application/x-portable-anymap',
            'application/x-world-x-3dmf',
            'image/bmp',
            'image/c',
            'image/cgm',
            'image/fif',
            'image/gif',
            'image/jpeg',
            'image/jpm',
            'image/jpx',
            'image/jp2',
            'image/naplps',
            'image/pjpeg',
            'image/png',
            'image/svg',
            'image/svg+xml',
            'image/tiff',
            'image/vnd.adobe.photoshop',
            'image/vnd.djvu',
            'image/vnd.fpx',
            'image/vnd.net-fpx',
            'image/x-cmu-raster',
            'image/x-cmx',
            'image/x-coreldraw',
            'image/x-cpi',
            'image/x-emf',
            'image/x-ico',
            'image/x-icon',
            'image/x-jg',
            'image/x-ms-bmp',
            'image/x-niff',
            'image/x-pict',
            'image/x-pcx',
            'image/x-portable-anymap',
            'image/x-portable-bitmap',
            'image/x-portable-greymap',
            'image/x-portable-pixmap',
            'image/x-quicktime',
            'image/x-rgb',
            'image/x-tiff',
            'image/x-unknown',
            'image/x-windows-bmp',
            'image/x-xpmi',
        );

        if (is_array($mimetype)) {
            $temp = $mimetype;
            if (array_key_exists('magicfile', $temp)) {
                unset($temp['magicfile']);
            }

            if (array_key_exists('headerCheck', $temp)) {
                unset($temp['headerCheck']);
            }

            if (empty($temp)) {
                $mimetype += $default;
            }
        }

        if (empty($mimetype)) {
            $mimetype = $default;
        }

        parent::__construct($mimetype);
    }

    protected function _throw($file, $errorType)
    {
        $this->_value = $file['name'];
        switch($errorType) {
            case Zend_Validate_File_MimeType::FALSE_TYPE :
                $errorType = self::FALSE_TYPE;
                break;
            case Zend_Validate_File_MimeType::NOT_DETECTED :
                $errorType = self::NOT_DETECTED;
                break;
            case Zend_Validate_File_MimeType::NOT_READABLE :
                $errorType = self::NOT_READABLE;
                break;
        }

        $this->_error($errorType);
        return false;
    }
}